The provisions of this chapter and of the regulatory codes herein adopted shall apply to the following:
(1) The location, design, materials, equipment, construction, reconstruction, alteration, repair, maintenance, moving, demolition, removal, use and occupancy of every building or structure or any appurtenances connected or attached to such building or structure;
(2) The installation, erection, alteration, repair, use and maintenance of plumbing systems consisting of house sewers, building drains, waste and vent systems, hot and cold water supply systems and all fixtures and appurtenances thereof;
(3) The installation, erection, alteration, repair, use and maintenance of mechanical systems consisting of heating, ventilating, air conditioning and refrigeration systems, fuel burning equipment and appurtenances thereof;
(4) The installation, erection, alteration, repair, use and maintenance of electrical systems and appurtenances thereof.
(Code 1977, § 7-1)